(2003-07-26 00:52:22) ArLi(950075)我的MSDN不全,System.Drawing.Imaging.ColorPalette 没有构造说明,我要上MSDN MS 去查一下,奇怪这东西在.net 里没有说明用法 (2003-07-26 00:52:51) ArLi(950075)原理是这样的,为你的IMG对象定义一个调色板,此调色板是灰度的,所以你的图像也会是灰度的 (2003-07-26 00:55:13) 蓝虫-<想见你(42420734)哦,那:1.定义调色板用?2.怎样设置灰度的调色板? (2003-07-26 00:56:13) ArLi(950075).ColorPalette 就是定义调色板用的,但是.net 怎么禁用了,将它变成了保护级别,又是密封类不让继承,那就说明永远无法访问到,真奇怪我才发现这个问题 (2003-07-26 00:56:29) ArLi(950075)以前beta 是可以的 (2003-07-26 00:57:23) ArLi(950075)
应该是 o.Palette = (2003-07-26 00:57:45) ArLi(950075)后面的值就是System.Drawing.Imaging.ColorPalette 类,可现在不让用了,晕 (2003-07-26 01:02:57) ArLi(950075)没法找不到,微软有构造了,但没有示例,也无从得知怎么访问。。
应该是 o.Palette = (2003-07-26 00:57:45) ArLi(950075)后面的值就是System.Drawing.Imaging.ColorPalette 类,可现在不让用了,晕 (2003-07-26 01:02:57) ArLi(950075)没法找不到,微软有构造了,但没有示例,也无从得知怎么访问。。
彩色BMP档转成灰度
作者: cww
将RGB想成3D之X,Y,Z轴,则BMP的RGB为(r,g,b)与座标(Y,Y,Y)距离最小时的Y即为灰度值
Y = 0.29900 * R + 0.58700 * G + 0.11400 * B
整数化
Y = ( 9798*R + 19235*G + 3735*B) / 32768
RGB(Y, Y, Y)就可以了
需一个内有彩色图的PictureBox, CommandBox
Option Explicit
Private Declare Function GetPixel Lib "gdi32" _
(ByVal hdc As Long, ByVal x As Long, ByVal Y As Long) As Long
Private Declare Function SetPixelV Lib "gdi32" _
(ByVal hdc As Long, ByVal x As Long, _
ByVal Y As Long, ByVal crColor As Long) As Long
Private tmpPic As Picture
Private Sub Form_Load()
Picture1.ScaleMode = 3 注释:设为Pixel
Picture1.AutoRedraw = True 注释:设定所有Pixel的改变不立即在pictureBox上显示
Set tmpPic = Picture1.Picture
End Sub
Private Sub Command1_click()
Dim width5 As Long, heigh5 As Long, rgb5 As Long
Dim hdc5 As Long, i As Long, j As Long
Dim bBlue As Long, bRed As Long, bGreen As Long
Dim Y As Long
width5 = Picture1.ScaleWidth
heigh5 = Picture1.ScaleHeight
hdc5 = Picture1.hdc
For i = 1 To width5
For j = 1 To heigh5
rgb5 = GetPixel(hdc5, i, j)
bBlue = Blue(rgb5)
bRed = Red(rgb5)
bGreen = Green(rgb5)
Y = (9798 * bRed + 19235 * bGreen + 3735 * bBlue) \ 32768
rgb5 = RGB(Y, Y, Y)
SetPixelV hdc5, i, j, rgb5
Next j
Next i
Set Picture1.Picture = Picture1.Image 注释:此时才真正显示Picture
End Sub
Private Function Red(ByVal mlColor As Long) As Long
Red = mlColor And &HFF
End Function
Private Function Green(ByVal mlColor As Long) As Long
Green = (mlColor \ &H100) And &HFF
End Function
Private Function Blue(ByVal mlColor As Long) As Long
Blue = (mlColor \ &H10000) And &HFF
End Function
我在vb.net和vb6里面都无法编译
在vb6中,我已经拖了内有彩色图的PictureBox1, CommandBox 1错误:Private Sub Form_Load()
Picture1.ScaleMode = 3Complie error:Syntax error
开始间隔性停电已经一个多月了我都不想上网了,敲一半不定就停电了。。上次我的路由坏了,POST 不了,不知你解决没有,再不行就参考:http://www.ccw.com.cn/htm/app/aprog/02_1_16_2.asp
不老先生叫我先用其他格式创一个,然后用drawImage来弄
还没试验。你下面的地址里面没有我需要的,那几个函数我都知道。再次感谢
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
...Bitmap myBitmap = new Bitmap(@"c:\sign.jpg");for(int Xcount = 0;Xcount<myBitmap.Width;Xcount++)
{
for(int Ycount= 0;Ycount<myBitmap.Height;Ycount++)
{
Color rgb5 = myBitmap.GetPixel(Xcount, Ycount);
byte bBlue =rgb5.B;
byte bRed =rgb5.R;
byte bGreen =rgb5.G;
int Y=(bBlue+bRed+bGreen)/3;
//int Y = (9798 * bRed + 19235 * bGreen + 3735 * bBlue)/32768 ;
NewColor = Color.FromArgb(Y, Y, Y);
myBitmap.SetPixel(Xcount,Ycount,NewColor);
}
}
myBitmap.Save(@"c:\1.jpg");